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Commitments and Contingent Liabilities - Additional Information (Detail) (USD $) |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Unused commitments and letters of credit [Member] | Dec. 31, 2012 Unused commitments and letters of credit [Member] | Mar. 31, 2013 Pending Litigation [Member] Accountsholder | Mar. 31, 2013 Pending Litigation [Member] IRA Market Rate Savings Account [Member] | Mar. 31, 2013 Pending Litigation [Member] IRA Market Rate Savings Account [Member] Minimum [Member] | Mar. 31, 2013 Other Matters [Member] | Mar. 31, 2013 Other Matters [Member] Minimum [Member] customer | Mar. 31, 2013 Other Matters [Member] Maximum [Member] customer
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Specified Average Age Of Account Holders |  |  |  |  | 64 years |  |  |  |  |
Notional amount of financial standby letters of credit | $ 36,000 |  |  |  |  |  |  |  |  |
Notional amount of performance standby letters of credit | 100,000 |  |  |  |  |  |  |  |  |
Notional amount of commercial letters of credit | 400.0 |  |  |  |  |  |  |  |  |
Financial instrument of credit risk | 200,000 | 200,000 |  |  |  |  |  |  |  |
Unfunded commitment liability |  |  | 2,300,000 | 2,400,000 |  |  |  |  |  |
Percentage of interest rate on deposits |  |  |  |  |  | 3.50% | 8.00% |  |  |
Number of account holders of specified average age |  |  |  |  | 237 |  |  |  |  |
Savings deposits |  |  |  |  | 11,500,000 |  |  |  |  |
Number of customers affected (in customers) |  |  |  |  |  |  |  |  | 700 | 900
Contingency reserve |  |  |  |  |  |  |  | 400,000 |  |
Estimate of possible loss in excess of reserve |  |  |  |  |  |  |  | $ 200,000 |  |

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